Then change something. Maybe you need to move, or go back to school, or get a different job.
Your situation isn't that unique. It's actually a big problem with "millennials" supposedly. They want to make a difference and they just aren't happy being a cog and not making any sort of impact. It takes a long time to make a difference, but you have to actually get to a place where you are at least headed in the right direction.
RE: What's the Purpose?